ML17252A987

Letter Confirming a 04/16/1973 Conversation Concerning Two Sustained High Reactor Pressure Switches Being Out of Calibration on 04/13/1973 - Dresden Unit 3

ML17252A987
Person / Time
Site:	Dresden
Issue date:	04/16/1973
From:	Worden W Commonwealth Edison Co
To:	Anthony Giambusso US Atomic Energy Commission (AEC)
References
Download: ML17252A987 (2)

Text

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TLXA247 WA8329Cl915)(!-032340C1050G2)PD 04/15/73 1914 ICS IPl"11JEI.~ nvN 012RP TOVE MORRIS IL 112 04-16 535P CST PMS MR A GIAMBUSSO. DEPUTY DIRECTOR FOR REACTOR PROJECT DIRECTORI0T OF LICENSING US ATOMIC E~rERG Y COMMISSION WUX WASHDC 20545 SURJECT DP4-25

. DRESDEN NUCLF.!\\R pOt..JER STt\\TIOt--~ U~HT THH!::E *

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. THIS 1:/ILL CONFIRM ;" cOrNERS!-1TION 1:/ITH f1R f'i/\\URA OF YOUR OFFICE AT 1530 HOURS T~IS DATE CONCERNING TWO SUSTAIN~D.HIGH REACTOR PRESSURE ~WITCHES BEING OUT OF CALIBRATION. THESE PRESSURE SWITCHf.S INU"TE *ISOLf.\\TIOr~ COi.JDENSOR

~.FTER A FIFTEEN.SECOND "

TIME DELAY. ON 4-13-73 PS3-2S3-538 WAS POUND TO TRIP AT.

i075PSIG AND PS3-253-53D ~AS FOUND TO TRIP nT 1073PSIG. TA3LE 3.2.2 OF THE TECH1N~L SPECIFICATION STATES THE TRIP LEVEL S~TTING SHOULD SE LESS THAN OR EQUAL TO.1070PSIG.

AFTER THE C~LIBRATION SHITCH 538 TRIPPED AT 1052PSIG AND THE SWITCH 53D AT 1056PSIG.

W P WORDEN SUPERINTENDANT DRESDEN NUCLE~R PO~ER STATION COMMONWEALTH EDISON CO RR!

MORRIS ILLINOIS IOSSPi::ST USAEC HOS GTWN

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USAEC *HQS GTWN WU WSH TLXA247 WAB328Cl916)(1-032340Cl06002)PD 04/16/73 1914 ICS IPMV£IA MVN 01288 TOVE MORRIS IL 112 04-16 535P CST PMS MR A GIAMBUSSO. DEPUTY DIRECTOR FO~ REACiOR PROJECT DIRECTORIAT OF LICENSING US ATOMIC ENER~Y COMMISSION WUX WASHDC 20545 SUBJECT DP4-25

• DRESOEN NUCLEAR POWER STATION UNIT iHREE.

-THI*S WILL CONFIRM

~ CON0ERSATION WITH MR MAURA OF YOUR,

OFFICE AT 1530 HOURS THIS DATE CONCERNING TWO.SUSTAINED HIGH REACTOR PRESSURE SWITCHES BEING out OF CALIBRATION. THESE PRESSURE SWITCHES INIATE ISOLATION CONDENSOR AFTER A FIFTEEN SECOND*.

TIME DELAY. ON 4-13-73 PS3-263-538 WAS FOUND TO TRIP AT 1075PSIG AND PS3-263-53D lvAS FOUND TO TRIP AT 107,)PSIG. TABLE 3.2.2 OF THE TECHINAL SPECIFICATION STATES THE TRIP LEVEL SETTING SHOULD BE LESS THhN QR EQUAL TO 1070PSIG.

AFTER THE CALIBRATION SWITCH 538 TRIPPED AT 1052PSIG AND THE SWITCH 530 AT 1056PSIG.

W P WORDtN SUPERINTENDANT DRESDEN NUCLEAR POWER STATION COMMONWEALTH EDISON CO RR!

M 0 RR I S ILL* I N 0 IS 1055PEST USA EC,HQS GTW N

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